<template>
	<div class="todo-footer" v-if="total">
		<label>
			<input type="checkbox" :checked="isAll" @change="checkAll"/>
		</label>
		<span>
			<span>已完成{{doneTotal}}</span> / 全部{{total}}
		</span>
		<button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
	</div>
</template>

<script>
	export default {
		name:"MyFooter",
		props:["todos","checkAllTodo","clearAllTodo"],
		computed:{
			doneTotal(){
				return this.todos.reduce((pre,current)=>{
					return pre + (current.done ? 1 : 0)
				},0)
			},
			total(){
				return this.todos.length
			},
			isAll(){
				return this.doneTotal === this.total && this.total > 0
			}
		},
		methods:{
			checkAll(e){ // eslint-disable-line no-unused-vars
				this.checkAllTodo(e.target.checked)
			},
			clearAll(){
				this.clearAllTodo()
			}
		}
	}
</script>

<style scoped="scoped">
/*footer*/
.todo-footer {
	height: 40px;
	line-height: 40px;
	padding-left: 6px;
	margin-top: 5px;
}
.todo-footer label {
	display: inline-block;
	margin-right: 20px;
	cursor: pointer;
}

.todo-footer label input {
	position: relative;
	top: -1px;
	vertical-align: middle;
	margin-right: 5px;
}
.todo-footer button {
	float: right;
	margin-top: 5px;
}	
</style>
